CN110713802A - Non-glue electrostatic protection film and preparation method thereof - Google Patents
Non-glue electrostatic protection film and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of protective films, in particular to a glue-free electrostatic protective film and a preparation method thereof. The adhesive-free electrostatic protection film comprises an inner layer, an intermediate layer and an outer layer which are sequentially arranged from inside to outside; the inner layer comprises the following components in parts by weight: 40-50 parts of EVA and 40-50 parts of SEBS; the intermediate layer comprises the following components in parts by weight: 60-65 parts of PE and 30-40 parts of metallocene polyethylene; the outer layer comprises the following components in parts by weight: 55-60 parts of PE, 30-35 parts of PP and 10-15 parts of an opening agent. The application discloses no gluey static protection film is through coextrusion integrated into one piece for stable bonding has characteristics that the process is simple, convenient operation between inlayer, intermediate level and the skin. The prepared adhesive-free electrostatic protection film has excellent antistatic property, adhesive force and flexibility.
Description
Technical Field
The invention relates to the technical field of protective films, in particular to a glue-free electrostatic protective film and a preparation method thereof.
Background
At present, electronic elements such as mobile phone screens, liquid crystal display screens and the like have precise structures and are relatively expensive. In order to prevent the electronic components from being scratched or otherwise damaged during transportation and use, an electrostatic protection film is usually adhered to the surface of the electronic components. The electrostatic protection film is useful for protecting the safety of electronic components and for preventing electrostatic damage to electronic components and the like.
The electrostatic protection film for protecting electronic components is adhered to an article by means of self electrostatic adsorption to play a role in protection, and is mainly filled with an antistatic agent such as polyethylene terephthalate. However, since the electrostatic protection film formed by adding an antistatic agent such as polyethylene terephthalate has a high surface resistivity, the effect of electrostatic protection is not stable, and the flexibility of the electrostatic protection film substrate is also affected, so that the effect of protecting electronic elements is not significant.
Disclosure of Invention
In view of the defects of the prior art, a first object of the present invention is to provide a non-adhesive electrostatic protection film, which has stable antistatic property and excellent flexibility, and has good protection effect on electronic elements.
The second purpose of the invention is to provide a preparation method of the adhesive-free electrostatic protection film, which is formed by one-step processing through a co-extrusion technology and has the advantages of convenient operation and stable structure of the electrostatic protection film.
In order to achieve the first object, the invention provides the following technical scheme:
a non-glue electrostatic protection film comprises an inner layer, a middle layer and an outer layer which are arranged from inside to outside in sequence;
the inner layer comprises the following components in parts by weight: 40-50 parts of EVA and 40-50 parts of SEBS;
the intermediate layer comprises the following components in parts by weight: 60-65 parts of PE and 30-40 parts of metallocene polyethylene;
the outer layer comprises the following components in parts by weight: 55-60 parts of PE, 30-35 parts of PP and 10-15 parts of an opening agent.
By adopting the technical scheme, the EVA is an ethylene-vinyl acetate copolymer, has excellent adhesive force with the base material, has electrostatic adsorption effect, achieves the antistatic effect and has certain viscosity; the SEBS is a linear triblock copolymer which takes polystyrene as a terminal segment and takes an ethylene-butylene copolymer obtained by hydrogenation of polybutadiene as a middle elastic block, has excellent plasticity and high elasticity, and can increase the flexibility of an inner layer; the compatibility of EVA and SEBS is good, so that the prepared inner layer can be stably adhered to the electronic element, and the electronic element is well protected.
The metallocene polyethylene in the middle layer is a novel thermoplastic plastic, and is compounded with PE for use, so that the toughness of the middle layer is improved, and the production cost is reduced; the EVA in the inner layer has excellent compatibility with metallocene polyethylene and PE, and the viscosity of the EVA is matched, so that the inner layer and the outer layer have excellent structural stability.
The outer layer is used as a first protective barrier of the electronic element, the high impact resistance and the moisture absorption resistance of PP are utilized, and the outer layer and the PE are compounded for use, so that the outer side has high flexibility, high impact resistance and antistatic property, and meanwhile, a good protective effect is provided for the middle layer and the inner layer. In addition, PE is added in the outer layer and the middle layer, so that the outer layer and the inner layer can be stably bonded, and the structural stability of the adhesive-free electrostatic protection film is improved.
In conclusion, the adhesive-free electrostatic protection film of the present application still has excellent antistatic property without adding an antistatic agent and an adhesive, and can be stably adhered to an electronic element, and at the same time, the excellent flexibility of the adhesive-free electrostatic protection film can provide a good protection effect for the electronic element.
Further, in the inner layer, the melt index of EVA at 190 ℃/2.16kg is 1.2-1.4 g/min.
By adopting the technical scheme, the EVA with the melt index of 1.2-1.4g/min under the condition of 190 ℃/2.16kg is selected, and the EVA has good fluidity and viscosity in the preparation process of the adhesive-free electrostatic protection film, and is beneficial to promoting the stable adhesion of the inner layer and the middle layer.
Further, in the inner layer, the EVA is maleic anhydride grafted EVA resin.
Through adopting above-mentioned technical scheme, grafting maleic anhydride on the EVA helps increasing the adhesive strength of EVA to polar material, can also effectively increase its electrostatic adsorption ability simultaneously for firm the absorption on electronic component of inlayer that it made adds antistatic protection to electronic component.
Further, the maleic anhydride grafted EVA resin is prepared by the following steps:
①, adding the EVA raw material, paraffin, plasticizer and antioxidant into a stirring tank according to the weight ratio of 90:5:2:3, heating and stirring until the EVA raw material, the paraffin, the plasticizer and the antioxidant are completely melted to obtain molten material;
②, adding maleic anhydride monomer into the molten material, and heating to 200 ℃ at the speed of 8-10 ℃/min under the rotating speed of 300-350r/min to obtain premix;
③, stirring for 30-40min in a molten state, injecting the premix into an extruder, extruding, cooling and granulating to obtain the final maleic anhydride grafted EVA resin.
By adopting the technical scheme, because the SEBS and the paraffin have excellent compatibility, the paraffin can be used for filling oil to the SEBS so as to improve the flexibility of the SEBS. Therefore, when the maleic anhydride grafted EVA resin is prepared according to the preparation method, due to the addition of the paraffin, the grafting rate of the maleic anhydride monomer can be improved, and the flexibility of the inner layer can be improved. The whole preparation method is simple in process and convenient to operate, and is beneficial to improving the production efficiency of the maleic anhydride grafted EVA resin.
Furthermore, in the maleic anhydride grafted EVA resin, the addition amount of a maleic anhydride monomer is 2.0-2.5% of the EVA raw material.
By adopting the technical scheme, when the addition amount of the maleic anhydride monomer is 2.0-2.5% of the EVA raw material, the grafting rate is higher, and the prepared maleic anhydride grafted EVA resin has more excellent antistatic performance and adhesive force.
Further, the PE in the middle and outer layers is LLDPE.
Further, PE in the middle layer and the outer layer is one or a mixture of LL6101RQ, LL6101XR and LL1002 YB.
By adopting the technical scheme, the LLDPE is linear low-density polyethylene and has low-temperature toughness, bending resistance and stress cracking resistance, so that the prepared adhesive-free electrostatic protection film has excellent toughness and provides a good protection effect for electronic elements. Of these, LL6101RQ, LL6101XR, and LL1002YB are preferable because their improving effects are most remarkable when used in the present application.
Further, the opening agent is prepared from oleamide and silicon dioxide according to the weight ratio of 1: 3 by weight ratio.
By adopting the technical scheme, the oleamide is an organic opening agent, and can be well dispersed in PP and PE on the outer layer to play a role in lubrication; silica is an inorganic opening agent, and is dispersed in the outer layer to reduce the viscosity of the outer layer and reduce adhesion during mold release. When oleamide and silica are mixed as 1: 3, the release effect of the non-adhesive electrostatic protective film can be remarkably improved, so that the non-adhesive electrostatic protective film is preferred.
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of a non-adhesive electrostatic protection film comprises the following steps:
a. melting of the film: respectively carrying out melting plasticization on the inner layer, the middle layer and the outer layer for 1.5-2min at the temperature of 200-220 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a blank body by the melt I, the melt II and the melt III at the extrusion speed of 0.6-1.0m/s, fixing the blank body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 800-1000mPa & s;
c. blow-curing of the cast melt: carrying out extrusion blow molding on the casting melt under the air pressure of 1.6-1.8MPa, wherein the melt III is positioned at the inner side, and the blow-up ratio is controlled to be (4-6): 1. the length-diameter ratio is (20-25): 1, cooling and solidifying by using cooling water at a flow rate of 40-60L/min to obtain a crude product;
d. cutting the primary product: and cutting the crude product by a cutting unit according to the specification requirement of the product to obtain the final adhesive-free electrostatic protection film.
Through adopting above-mentioned technical scheme, the gluey electrostatic protection film of this application is through coextrusion integrated into one piece for stable bonding between inlayer, intermediate level and the skin helps improving the production efficiency of gluey electrostatic protection film simultaneously, has the characteristics that the process is simple, convenient operation.
In conclusion, the invention has the following beneficial effects:
1. the adhesive-free electrostatic protection film still has excellent antistatic property on the premise of not adding an antistatic agent and an adhesive, can be stably adhered to an electronic element, and meanwhile, has excellent flexibility and can provide good protection effect for the electronic element;
2. according to the application, the self-made maleic anhydride grafted EVA resin is used, so that the antistatic performance and the adhesive force of the adhesive-free electrostatic protective film can be further improved;
3. the application discloses no gluey static protection film is through coextrusion integrated into one piece for stable bonding has characteristics that the process is simple, convenient operation between inlayer, intermediate level and the skin.
Drawings
FIG. 1 is a process diagram for preparing maleic anhydride grafted EVA resin;
fig. 2 is a process diagram for preparing a non-adhesive electrostatic protection film.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
1. Raw material preparation
1.1、EVA
Self-making: the maleic anhydride grafted EVA resin is prepared by the following steps, referring to figure 1:
①, adding the EVA raw material, paraffin, plasticizer and antioxidant into a stirring tank according to the weight ratio of 90:5:2:3, heating and stirring until the EVA raw material, the paraffin, the plasticizer and the antioxidant are completely melted to obtain molten material;
②, adding maleic anhydride monomer into the molten material, wherein the addition amount of the maleic anhydride monomer is 2.0-2.5% of the EVA raw material, and heating to 200 ℃ at the speed of 8-10 ℃/min under the rotating speed of 300-350r/min to obtain a premix;
③, stirring for 30-40min in a molten state, injecting the premix into an extruder, extruding, cooling and granulating to obtain the final maleic anhydride grafted EVA resin.
The prepared maleic anhydride grafted EVA resin has a melt index of 1.2-1.4g/min under the condition of 190 ℃/2.16 kg.
1.2, SEBS: american kraton, brand E1830.
1.3、PE
LLDPE (linear low density polyethylene): exxon Mobil, brands LL6101RQ, LL6101XR, LL1002YB, LL 3003;
HDPE (high density polyethylene): exxon Mobil, brand 23TH 185.
1.4, metallocene polyethylene: exxonmobil, mark 1018 EA.
1.5, PP: exxon Mobil, grade 7684 KN.
1.6, oleamide: the content of the product is more than or equal to 98% by manufacturers at the source of the Jiangxi Intelligent Union technology.
1.7, silica: weifang Sanjia nanometer new material science and technology Limited company with the model of SJ-65 friction type.
2. Examples of the embodiments
2.1, example 1
A non-glue electrostatic protection film comprises an inner layer, a middle layer and an outer layer which are arranged from inside to outside in sequence;
the inner layer comprises the following components in parts by weight: 45 parts of maleic anhydride grafted EVA resin and 50 parts of SEBS;
the middle layer comprises the following components in parts by weight: LL6101RQ 60, 40 parts of metallocene polyethylene;
the outer layer comprises the following components in parts by weight: LL6101RQ 60 parts, PP 30 parts, a mixture of oleamide and silicon dioxide in a weight ratio of 1: 3, and 10 parts of an opening agent compounded by the weight ratio of 3.
The preparation method of the adhesive-free electrostatic protection film comprises the following steps:
a. melting of the film: respectively carrying out melt plasticization on the inner layer, the middle layer and the outer layer for 1.5min at the temperature of 200 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a green body by the melt I, the melt II and the melt III at the extrusion speed of 0.8m/s, fixing the green body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 900mPa & s;
c. blow-curing of the cast melt: carrying out extrusion blow molding on the casting melt under the air pressure of 1.7MPa, wherein the melt III is positioned at the inner side, and the blow-up ratio is controlled to be 5: 1. the length-diameter ratio is 20: 1, cooling and solidifying by using cooling water at the flow rate of 40L/min to obtain a crude product;
d. cutting the primary product: and cutting the crude product by a cutting unit according to the specification requirement of the product to obtain the final adhesive-free electrostatic protection film.
2.2, examples 2 to 4
Examples 2-4 the parameters of the maleic anhydride grafted EVA resin were adjusted based on the method of example 1, and the specific adjustments are shown in Table one below.
TABLE A parameter Table for the maleic anhydride grafted EVA resins of examples 1-4
2.3, examples 5 to 11
Examples 5 to 11 the parameters of each layer of the non-adhesive electrostatic protection film were adjusted based on the method of example 1, and the specific adjustment is shown in table two below.
TABLE II parameter tables of non-adhesive electrostatic protection films of example 1 and examples 5-11
2.4, examples 12 to 13
Examples 12 to 13 the preparation parameters of each layer of the non-adhesive electrostatic protection film were adjusted based on the method of example 1, and the specific adjustment is shown in table three below.
Table three preparation parameters of non-adhesive electrostatic protection films of example 1 and examples 12-13
| Example 1 | Example 12 | Example 13 | |
| Melting temperature/. degree.C | 200 | 210 | 220 |
| Plastification time/min | 1.5 | 2.0 | 1.8 |
| Extrusion time/m/s | 0.8 | 0.6 | 1.0 |
| viscosity/mPas | 900 | 1000 | 800 |
| Air pressure/MPa | 1.7 | 1.6 | 1.8 |
| Blow-up ratio | 5:1 | 4:1 | 6:1 |
| Aspect ratio | 20:1 | 25:1 | 22:1 |
| Flow rate of cooling water/L/min | 40 | 50 | 60 |
| Thickness/mm | 0.05 | 0.05 | 0.05 |
3. Comparative example
3.1, comparative example 1
Purchased from WANSHAOSHANG ELECTRONIC CO., LTD, Dongguan, series L-8007, and having a thickness of 0.07 mm.
3.2, comparative example 2
Purchased from a south China sea Huaxin packaging material factory in Foshan City, the main material is PE, and the thickness is 0.05 mm.
4. Performance testing
The electrostatic protection films of the above examples 1 to 13 and comparative examples 1 to 2 were subjected to the following performance tests, and the test results are shown in the following table four.
4.1, resistivity: the measurement was carried out according to the standard GB/T13541.
4.2, peel strength: measured according to ASTM D429-81, method B.
4.3, tensile ratio and tensile strength: the measurement was carried out according to the method of GB/T1040.3.
4.4, demolding effect: visual inspection was carried out. Wherein A + represents that the demoulding effect is excellent, and the surface is smooth and flat without defects; a shows that the demolding effect is good, and the surface flatness is inferior to A +; a-shows that the demolding effect is general, and small pits are formed in the surface of the mold, but the normal use of the mold is not affected.
TABLE IV tables of preparation parameters of electrostatic protection films of examples 1 to 13 and comparative examples 1 to 2
Referring to table four, from the test results of examples 1-13 and comparative examples 1-2, it can be seen that, compared with the currently commercially available electrostatic protection films, the non-adhesive electrostatic protection film of the present application still has excellent antistatic property (as shown by resistivity, the higher the resistivity, the better the antistatic effect) without adding antistatic agent and adhesive, and can be stably adhered to the electronic component (as shown by glass strength) so as not to fall off from the electronic product during use; at the same time, its excellent flexibility (in terms of elongation and tensile strength) also provides good protection for electronic components.
From the test results of examples 1 to 4 and examples 7 to 8, it can be seen that the antistatic performance and the adhesive force of the adhesive-free electrostatic protection film can be further improved by using the self-made maleic anhydride grafted EVA resin.
From the test results of examples 1, 5 to 6, and 9 to 10, it can be seen that the PE of the present application using LLDPE is useful for improving the flexibility and releasing effect of the non-tacky electrostatic protective film, and the improvement effect is more remarkable when it is further preferably one or a mixture of LL6101RQ, LL6101XR, and LL1002 YB.
From the results of the tests of examples 1 and 11, it was found that the reaction was carried out using a mixture of oleamide and silica in a ratio of 1: 3, the demolding effect of the adhesive-free electrostatic protection film can be effectively improved. In addition, the flexibility of the material can be increased to a certain extent.
From the detection results of the embodiments 1 and 12-13, the adhesive-free electrostatic protection film can be formed integrally by co-extrusion, so that the inner layer, the middle layer and the outer layer are stably bonded, and the adhesive-free electrostatic protection film has the characteristics of simple process and convenience in operation.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A non-glue electrostatic protection film is characterized by comprising an inner layer, a middle layer and an outer layer which are sequentially arranged from inside to outside;
the inner layer comprises the following components in parts by weight: 40-50 parts of EVA and 40-50 parts of SEBS;
the intermediate layer comprises the following components in parts by weight: 60-65 parts of PE and 30-40 parts of metallocene polyethylene;
the outer layer comprises the following components in parts by weight: 55-60 parts of PE, 30-35 parts of PP and 10-15 parts of an opening agent.
2. The adhesive-free electrostatic protective film according to claim 1, wherein the melt index of EVA in the inner layer is 1.2-1.4g/min at 190 ℃/2.16 kg.
3. The adhesive-free electrostatic protective film according to claim 1, wherein the EVA of the inner layer is maleic anhydride grafted EVA resin.
4. The non-glue electrostatic protection film according to claim 3, wherein the maleic anhydride grafted EVA resin is prepared by the following steps:
①, adding the EVA raw material, paraffin, plasticizer and antioxidant into a stirring tank according to the weight ratio of 90:5:2:3, heating and stirring until the EVA raw material, the paraffin, the plasticizer and the antioxidant are completely melted to obtain molten material;
②, adding maleic anhydride monomer into the molten material, and heating to 200 ℃ at the speed of 8-10 ℃/min under the rotating speed of 300-350r/min to obtain premix;
③, stirring for 30-40min in a molten state, injecting the premix into an extruder, extruding, cooling and granulating to obtain the final maleic anhydride grafted EVA resin.
5. The non-glue electrostatic protection film according to claim 4, wherein the addition amount of the maleic anhydride monomer in the maleic anhydride grafted EVA resin is 2.0-2.5% of the EVA raw material.
6. The non-adhesive electrostatic protective film according to claim 1, wherein the PE in the middle layer and the outer layer is LLDPE.
7. The non-glue electrostatic protection film according to claim 6, wherein PE in the middle layer and the outer layer is one or a mixture of LL6101RQ, LL6101XR and LL1002 YB.
8. The non-tacky electrostatic protective film of claim 1 wherein the opening agent is formed from oleamide and silica in a ratio of 1: 3 by weight ratio.
9. The method for preparing the non-glue electrostatic protection film according to any one of claims 1 to 8, characterized by comprising the following steps:
a. melting of the film: respectively carrying out melting plasticization on the inner layer, the middle layer and the outer layer for 1.5-2min at the temperature of 200-220 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a blank body by the melt I, the melt II and the melt III at the extrusion speed of 0.6-1.0m/s, fixing the blank body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 800-1000mPa & s;
c. blow-curing of the cast melt: carrying out extrusion blow molding on the casting melt under the air pressure of 1.6-1.8MPa, wherein the melt III is positioned at the inner side, and the blow-up ratio is controlled to be (4-6): 1. the length-diameter ratio is (20-25): 1, cooling and solidifying by using cooling water at a flow rate of 40-60L/min to obtain a crude product;
d. cutting the primary product: and cutting the crude product by a cutting unit according to the specification requirement of the product to obtain the final adhesive-free electrostatic protection film.
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